SLVSDW8A September 2017 – February 2018 TPS22917
PRODUCTION DATA.
A capacitor to VIN on the CT pin sets the slew rate of VOUT. The CT capacitor voltage will ramp until shortly after the switch is turned on and VOUT becomes stable.
Leaving the CT pin open will result in the highest slew rate and fastest turn on time. These values can be found in the Switching Characteristics Table. For slower slew rates the required CT capacitor can be found using Equation 1:
where
The total turn on time has a direct correlation to the output slew rate. The fastest turn on times (tON), with CT pin open, can be found in the Switching Characteristics. For slower slew rates, the resulting turn on time can be found with Equation 2:
where